Table 1.

Summary of the wild bird species from which eggs were collected at each location, along with the GPS coordinates, closest river, pool number, number of eggs per pool (n), habitat and feeding guilds according to Hockey et al. (2005), and mean egg mass (g)

Location	Longitude	Latitude	River	Pool no	n	Common name	Scientific name	Habitat guild	Feeding guild	Egg mass
Barbers Pan	25,57	−266	Harts River	1	6	Grey Heron	Ardea cinerea	Aquatic	Large aquatic predator	61
				5	5	African Darter	Anhinga rufa	Aquatic	Large aquatic predator	37
				14	5	Black-headed Heron	Ardea melanocephala	Terrestrial	Terrestrial insectivore	60
Bloemhof Dam	2564	−277	Vaal River	2	3	Great White Egret	Ardea alba	Aquatic	Large aquatic predator	61
				3	5	Grey Heron	Ardea cinerea	Aquatic	Large aquatic predator	61
				6	3	African Darter	Anhinga rufa	Aquatic	Large aquatic predator	37
				8	5	Reed Cormorant	Microcarbo africanus	Aquatic	Large aquatic predator	21
				10	6	African Sacred Ibis	Threskiornis aethiopicus	Wetland	Scavenger	62
				11	4	Little Egret	Egretta garzetta	Aquatic	Small aquatic predator	28
				16	6	Cattle Egret	Bubulcus ibis	Terrestrial	Terrestrial insectivore	27
Eldorado Park	2788	−263	Klip River	4	5	African Sacred Ibis	Threskiornis aethiopicus	Wetland	Scavenger	62
Potchefstroom	2709	−2678	Mooi River	7	5	Reed Cormorant	Microcarbo africanus	Aquatic	Large aquatic predator	21
				9	5	Glossy Ibis	Plegadis falcinellus	Wetland	Small aquatic predator	34
				12	5	Black-headed Heron	Ardea melanocephala	Terrestrial	Terrestrial insectivore	60
				13	4	Black-headed Heron	Ardea melanocephala	Terrestrial	Terrestrial insectivore	60
				15	5	Cattle Egret	Bubulcus ibis	Terrestrial	Terrestrial insectivore	27